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Re: linux cache routines for Write-back cache policy on MIPS24KE

To: Geert Uytterhoeven <geert@linux-m68k.org>
Subject: Re: linux cache routines for Write-back cache policy on MIPS24KE
From: veerasena reddy <veerasena_b@yahoo.co.in>
Date: Mon, 1 Oct 2007 13:13:47 +0100 (BST)
Cc: linux-mips <linux-mips@linux-mips.org>, "linux-kernel.org" <linux-kernel@vger.kernel.org>
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hi Geert,

here i mean 'flush' is 'write-back only'

Regards,
Veerasena.
--- Geert Uytterhoeven <geert@linux-m68k.org> wrote:

> On Mon, 1 Oct 2007, veerasena reddy wrote:
> > In linux-2.6.18 (for MIPS24KE processor):
> > suppose if i want to do flush only then which API
> i
> > should use?
> 
> `flush' is fuzzy terminology: some people mean
> invalidate, others mean
> write back, others mean both.
> 
> > Similarly, if i want to do invalidation only which
> API
> > i should use?
> 
> dma_cache_inv().
> 
> > --- Geert Uytterhoeven <geert@linux-m68k.org>
> wrote:
> > 
> > > On Mon, 1 Oct 2007, veerasena reddy wrote:
> > > > I have ported Linux-2.6.18 kernel on MIPS24KE
> > > > processor. I am using write back cache policy.
> > > > 
> > > > Could you please guide me under what cases the
> > > below
> > > > cache API's are being used:
> > > > - dma_cache_wback_inv() : Could you explain 
> what
> > > > exactly this function does
> > > 
> > > It does both write back and invalidate.
> > > 
> > > > - dma_cache_wback() : This function write back
> the
> > > > cache data to memory
> > > > - dma_cache_inv  : This function invalidate
> the
> > > cache
> > > > tags. so subsequent access will fetch from
> memory.
> > > 
> > > Note that 2.6.18 is old. The above functions are
> > > intended to be removed.
> 
> Gr{oetje,eeting}s,
> 
>                                               Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond
> ia32 -- geert@linux-m68k.org
> 
> In personal conversations with technical people, I
> call myself a hacker. But
> when I'm talking to journalists I just say
> "programmer" or something like that.
>                                                           -- Linus Torvalds
> 
> 



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